The pollen concentration is high in the upper samples but decreases with depth,
indicating progressive deterioration. Paradoxically, the percentages of
deteriorated pollen is highest in the upper samples. Although Sporormiella
spores are present in the lowest sample (indicating some mixing), other historic
indicators (Erodium cf. cicutarium, and Thecaphora) are
limited to the top sample. The sharp decrease in Liguliflorae pollen above 30 cm
also indicates that mixing has been limited. As at nearby CA-Ora-1089, Artemisia
pollen percentages increase dramatically in the surface sample. Perhaps the historic
horizon (200 years ago) can be placed at 20 - 30 cm.

It is interesting that no Opuntia pollen was encountered even though the plant
is mentioned in the site report.